Effects of N-Alkanol Adsorption on Bubble Acceleration and Local Velocities in Solutions of the Homologous Series from Ethanol to N-Decanol
The influence of n-alkanol (C2–C10) water solutions on bubble motion was studied in a wide range of concentrations. Initial bubble acceleration, as well as local, maximal and terminal velocities during motion were studied as a function of motion time. Generally, two types of velocity profiles were o...
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MDPI AG
2023-03-01
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| Online Access: | https://www.mdpi.com/1996-1944/16/5/2125 |
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| author | Marcel Krzan Pradipta Chattopadhyay Sandra Orvalho Maria Zednikova |
| author_facet | Marcel Krzan Pradipta Chattopadhyay Sandra Orvalho Maria Zednikova |
| author_sort | Marcel Krzan |
| collection | DOAJ |
| description | The influence of n-alkanol (C2–C10) water solutions on bubble motion was studied in a wide range of concentrations. Initial bubble acceleration, as well as local, maximal and terminal velocities during motion were studied as a function of motion time. Generally, two types of velocity profiles were observed. For low surface-active alkanols (C2–C4), bubble acceleration and terminal velocities diminished with the increase in solution concentration and adsorption coverage. No maximum velocities were distinguished. The situation is much more complicated for higher surface-active alkanols (C5–C10). In low and medium solution concentrations, bubbles detached from the capillary with acceleration comparable to gravitational acceleration, and profiles of the local velocities showed maxima. The terminal velocity of bubbles decreased with increasing adsorption coverage. The heights and widths of the maximum diminished with increasing solution concentration. Much lower initial acceleration values and no maxima presence were observed in the case of the highest n-alkanol concentrations (C5–C10). Nevertheless, in these solutions, the observed terminal velocities were significantly higher than in the case of bubbles moving in solutions of lower concentration (C2–C4). The observed differences were explained by different states of the adsorption layer in the studied solutions, leading to varying degrees of immobilization of the bubble interface, which generates other hydrodynamic conditions of bubble motion. |
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| id | doaj.art-9bd2a0c8ae584c3982e658dfb27b9ff9 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-11T07:18:44Z |
| publishDate | 2023-03-01 |
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| spelling | doaj.art-9bd2a0c8ae584c3982e658dfb27b9ff92023-11-17T08:07:39ZengMDPI AGMaterials1996-19442023-03-01165212510.3390/ma16052125Effects of N-Alkanol Adsorption on Bubble Acceleration and Local Velocities in Solutions of the Homologous Series from Ethanol to N-DecanolMarcel Krzan0Pradipta Chattopadhyay1Sandra Orvalho2Maria Zednikova3Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, 30-239 Krakow, PolandDepartment of Chemical Engineering, BITS-Pilani, Pilani PIN-333031, Rajasthan, IndiaInstitute of Chemical Process Fundamentals of the CAS, Rozvojová 1, 165 00 Prague, Czech RepublicInstitute of Chemical Process Fundamentals of the CAS, Rozvojová 1, 165 00 Prague, Czech RepublicThe influence of n-alkanol (C2–C10) water solutions on bubble motion was studied in a wide range of concentrations. Initial bubble acceleration, as well as local, maximal and terminal velocities during motion were studied as a function of motion time. Generally, two types of velocity profiles were observed. For low surface-active alkanols (C2–C4), bubble acceleration and terminal velocities diminished with the increase in solution concentration and adsorption coverage. No maximum velocities were distinguished. The situation is much more complicated for higher surface-active alkanols (C5–C10). In low and medium solution concentrations, bubbles detached from the capillary with acceleration comparable to gravitational acceleration, and profiles of the local velocities showed maxima. The terminal velocity of bubbles decreased with increasing adsorption coverage. The heights and widths of the maximum diminished with increasing solution concentration. Much lower initial acceleration values and no maxima presence were observed in the case of the highest n-alkanol concentrations (C5–C10). Nevertheless, in these solutions, the observed terminal velocities were significantly higher than in the case of bubbles moving in solutions of lower concentration (C2–C4). The observed differences were explained by different states of the adsorption layer in the studied solutions, leading to varying degrees of immobilization of the bubble interface, which generates other hydrodynamic conditions of bubble motion.https://www.mdpi.com/1996-1944/16/5/2125bubblealkanolsadsorption coverageaccelerationbubble velocityfluidity of interface |
| spellingShingle | Marcel Krzan Pradipta Chattopadhyay Sandra Orvalho Maria Zednikova Effects of N-Alkanol Adsorption on Bubble Acceleration and Local Velocities in Solutions of the Homologous Series from Ethanol to N-Decanol Materials bubble alkanols adsorption coverage acceleration bubble velocity fluidity of interface |
| title | Effects of N-Alkanol Adsorption on Bubble Acceleration and Local Velocities in Solutions of the Homologous Series from Ethanol to N-Decanol |
| title_full | Effects of N-Alkanol Adsorption on Bubble Acceleration and Local Velocities in Solutions of the Homologous Series from Ethanol to N-Decanol |
| title_fullStr | Effects of N-Alkanol Adsorption on Bubble Acceleration and Local Velocities in Solutions of the Homologous Series from Ethanol to N-Decanol |
| title_full_unstemmed | Effects of N-Alkanol Adsorption on Bubble Acceleration and Local Velocities in Solutions of the Homologous Series from Ethanol to N-Decanol |
| title_short | Effects of N-Alkanol Adsorption on Bubble Acceleration and Local Velocities in Solutions of the Homologous Series from Ethanol to N-Decanol |
| title_sort | effects of n alkanol adsorption on bubble acceleration and local velocities in solutions of the homologous series from ethanol to n decanol |
| topic | bubble alkanols adsorption coverage acceleration bubble velocity fluidity of interface |
| url | https://www.mdpi.com/1996-1944/16/5/2125 |
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